The transmission impulse response
(Fourier transform of the amplitude transmission spectrum) can be measured with
an OLCR based on a Mach-Zender interferometer. Fig. 4-13 present a time
multiplexing OLCR design set-up that use the same components as the set-up used
for reflection measurements (at the exception of the second 3 dB coupler).
The attenuator in the balanced detection has been omitted but it can be added
if the second coupler shows a splitting ratio that is not exactly 50/50 in
intensity.
Fig. 4-13 OLCR set-up for transmission measurement
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